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opendistro-elasticsearch-sql.release-notes
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## 2019-04-19, Version 0.9.0 (Current)
### Notable Changes
* Feature [#29](https://github.com/opendistro-for-elasticsearch/sql/issues/29): Add support for Elasticsearch 6.7.1
* Migration [#17](https://github.com/opendistro-for-elasticsearch/sql/issues/17): Migrate legacy integration tests in Maven to ES test in Gradle.
## 2019-04-02, Version 0.8.0
### Notable Changes
* Feature [#12](https://github.com/opendistro-for-elasticsearch/sql/issues/12): Add support for Elasticsearch 6.6.2
* Bug fix [#9](https://github.com/opendistro-for-elasticsearch/sql/issues/9): Fix issue for query by index pattern in JDBC driver.
* Bug fix [#10](https://github.com/opendistro-for-elasticsearch/sql/issues/10): Return friendly error message instead of NPE for illegal query and other exception cases.
## 2019-03-11, Version 0.7.0
### Notable Changes
In this release, the following features are added with many other minor improvements and bug fixes.
* **SQL HAVING**:
* Add support for SQL HAVING to filter aggregated result after GROUP BY.
* **SQL Functions**:
* Common math functions as well as date function are available.
* **Nested Field Query**:
* Query nested field in SQL++ syntax instead of explicit nested() function.
* **JSON in RESTful Request**:
* Support JSON payload to allow for ESRally benchmark and parameters in JDBC request. And also pretty format and flatten native Elasticsearch DSL as response.
* **Block Hash Join**:
* Introduced new query planning framework and new hash join algorithm with memory protection mechanism to perform hash join block by block safely.
### Major Refactoring & Architecture Changes
* **Avoid I/O Operation in NIO Thread**
* Move I/O blocking operations to custom worker thread pool or prefetch to avoid blocking. Meanwhile non-blocking operations still run in Elasticsearch transport thread for efficiency.
### Commits
* [[`56dd269`](https://github.com/mauve-hedgehog/opendistro-elasticsearch-sql/commit/56dd269871259dae9fb77ab512005b9a714d728e)] Initial commit